4 Inch Coco Jiffy Cube - Propagation Cube with 1.5 Inch Hole
Best for: potting up rooted cuttings and seedlings from a smaller propagation plug into something bigger before the final container.
Our thoughts
The old listing for this one had picked up "proper tent construction and light-tight performance" as its opening line, which makes no sense for a coco propagation cube - clearly copy-pasted from the wrong template, so we've rewritten it properly. It's a genuinely useful in-between step that a lot of new growers skip and shouldn't. One we sell a lot of for new growers.
Once a cutting or seedling has properly rooted into its starter plug, it needs somewhere bigger to keep developing before it goes into a full-size container - that's exactly what this is for. The 4 inch Jiffy Cube is made from dehydrated, compressed coco coir and comes with a 1.5 inch hole at the top, giving you a quick way to increase the rooting area available to a cutting or seedling and support continued growth through the early vegetative stage.
It's supplied dry and compressed for easy storage, expanding once hydrated to roughly 100mm x 100mm x 55mm. The coco pith is buffered, with a water holding capacity of around 60-75% and air-filled porosity of 20-35%, giving young roots a good balance of moisture and oxygen while they establish.
How it compares
Propagation media generally splits into rockwool, peat-based plugs and coco-based cubes like this one.
- Coco coir avoids the disposal and irritation issues associated with rockwool, while still holding structure well through the transplant stage
- The 1.5 inch hole is sized to directly accept plugs from smaller propagation systems, rather than needing you to dig a hole yourself and risk damaging young roots
- Supplied dehydrated for storage, so you can keep a stock on hand and hydrate only what you need for a given batch
A straightforward, low-cost step-up stage between a small starter plug and a full-size pot.
Usage guidance
Hydrating
Soak the dehydrated cube in water until fully expanded before use - it will roughly double in size as it takes on moisture.
Transplanting
Slot your rooted plug or cutting into the 1.5 inch hole at the top, ensuring good root-to-media contact so roots can push out into the surrounding coco.
Watering
Keep consistently moist without waterlogging during the early growth stage - coco holds moisture well but shouldn't be left sitting in standing water.
Potting on
Move to a full-size container once roots are visibly reaching the edges of the cube, rather than leaving plants root-bound in the smaller cube.
Technical specifications
- Brand: Jiffy
- Material: compressed, dehydrated coco coir (coco pith)
- Size: 100mm x 100mm, expanding to approximately 100mm x 100mm x 55mm
- Hole size: 1.5 inch (approximately 40mm)
- Water holding capacity: approximately 60-75%
- Air-filled porosity: approximately 20-35%
- Storage: long shelf life when kept dehydrated
Who this is for
- Growers stepping cuttings up from a small propagation plug before final potting
- Anyone propagating from seed who wants a coco-based alternative to rockwool
- Growers wanting to stock media in a compact, dehydrated form until needed
Our take
This is a cheap, practical way to give young plants room to develop before committing them to a full-size pot, without the handling issues that come with rockwool. Buy a batch and keep them dry until you need them.
Worth picking up if you want equipment you can rely on.
